华润彭城发电厂1号汽轮发电机组轴承振动分析及处理

1号汽轮发电机组自1996年投运以来一直存在发电机、励磁机转子通过其临界转速区域轴振动大的问题，严重影响其调峰运行，电厂不断努力试图解决该问题，但因该振动复杂及真正原因未能认识，致使该问题长期没有得到解决。通过对轴系振型分析和现场动平衡试验比较，诊断该振动的根本原因是发电机转子存在较大二阶质量不平衡．它是制造厂出厂前动平衡质量不佳．导致残余振动过大的结果。2004年5月．利用该机组大修机会，在现场采用断开励磁机，单转汽轮机—发电机的方式对发电机转子进行精细动平衡后，使连成轴系后发电机、励磁机转子临界转速区域6、7号轴承的轴振降低至报警值(125μm)以内，彻底解决该振动问题。

Analysis and handling of bearing vibration of No.1 steam turbine-generator in Huarun Pengcheng Power Plant

The problem of high shaft vibration during generator rotor's 2nd critical speed and exciter rotor's 1st critical speed was always existed since the No.1 turbine-generator set was commissioned in 1996. The vibration affected the operation of load regulation seriously. Many efforts were made to try to solve the problem, but there was no result because of the complexity. By means of comparing the vibration mode with the dynamic balance tests, the root reason was found to be the bigger 2nd mode mass unbalance of the generator rotor which was caused by poor rotor dynamic balance quality in manufacturer. In an overhaul of the No.1 set in May 2004, a fine 2nd dynamic balance for the generator rotor was made after separating the exciter rotor from the generator rotor in field. Then the vibration was thoroughly settled.